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<div class="title">prng.h</div>  </div>
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<a href="prng_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/* prng.h -- Pseudo Random Numbers</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (C) 2010--2012 Olaf Bergmann &lt;bergmann@tzi.org&gt;</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * This file is part of the library tinydtls. Please see</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * README for terms of use. </span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#ifndef _DTLS_PRNG_H_</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define _DTLS_PRNG_H_</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="tinydtls_8h.html">tinydtls.h</a>&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#ifndef WITH_CONTIKI</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="group__prng.html#ga3f4036a1abfcec552ab583a2dc37be6c">   33</a></span>&#160;<a class="code" href="group__prng.html#ga3f4036a1abfcec552ab583a2dc37be6c">dtls_prng</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len) {</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;  <span class="keywordflow">while</span> (len--)</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    *buf++ = rand() &amp; 0xFF;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;}</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="group__prng.html#gac68680277206146d06c9e5468f260ee0">   40</a></span>&#160;<a class="code" href="group__prng.html#gac68680277206146d06c9e5468f260ee0">dtls_prng_init</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> seed) {</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    srand(seed);</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;}</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="preprocessor">#else </span><span class="comment">/* WITH_CONTIKI */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="preprocessor">#include &quot;random.h&quot;</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="preprocessor">#ifdef HAVE_PRNG</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="preprocessor"></span><span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<a class="code" href="group__prng.html#ga3f4036a1abfcec552ab583a2dc37be6c">dtls_prng</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len)</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;{</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="keywordflow">return</span> contiki_prng_impl(buf, len);</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;}</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<a class="code" href="group__prng.html#ga3f4036a1abfcec552ab583a2dc37be6c">dtls_prng</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len) {</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> v = random_rand();</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;  <span class="keywordflow">while</span> (len &gt; <span class="keyword">sizeof</span>(v)) {</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    memcpy(buf, &amp;v, <span class="keyword">sizeof</span>(v));</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    len -= <span class="keyword">sizeof</span>(v);</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    buf += <span class="keyword">sizeof</span>(v);</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    v = random_rand();</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;  }</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  memcpy(buf, &amp;v, len);</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;}</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* HAVE_PRNG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<a class="code" href="group__prng.html#gac68680277206146d06c9e5468f260ee0">dtls_prng_init</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> seed) {</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;  <span class="comment">/* random_init() messes with the radio interface of the CC2538 and</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment">   * therefore must not be called after the radio has been</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment">   * initialized. */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="preprocessor">#ifndef CONTIKI_TARGET_CC2538DK</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="preprocessor"></span>    random_init(seed);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="preprocessor"></span>}</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* WITH_CONTIKI */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* _DTLS_PRNG_H_ */</span><span class="preprocessor"></span></div>
<div class="ttc" id="tinydtls_8h_html"><div class="ttname"><a href="tinydtls_8h.html">tinydtls.h</a></div><div class="ttdoc">public tinydtls API </div></div>
<div class="ttc" id="group__prng_html_gac68680277206146d06c9e5468f260ee0"><div class="ttname"><a href="group__prng.html#gac68680277206146d06c9e5468f260ee0">dtls_prng_init</a></div><div class="ttdeci">static void dtls_prng_init(unsigned short seed)</div><div class="ttdef"><b>Definition:</b> <a href="prng_8h_source.html#l00040">prng.h:40</a></div></div>
<div class="ttc" id="group__prng_html_ga3f4036a1abfcec552ab583a2dc37be6c"><div class="ttname"><a href="group__prng.html#ga3f4036a1abfcec552ab583a2dc37be6c">dtls_prng</a></div><div class="ttdeci">static int dtls_prng(unsigned char *buf, size_t len)</div><div class="ttdef"><b>Definition:</b> <a href="prng_8h_source.html#l00033">prng.h:33</a></div></div>
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